1.OA.B.4

Understand subtraction as an unknown-addend problem. For example, subtract 10 - 8 by finding the number that makes 10 when added to 8.

 
8 Lesson(s)
   

Math Fact Sorting

1st Grade Math » Unit: Solving 3 Addend Problems
1st Grade Math » Unit: Solving 3 Addend Problems
Amanda Cole
New Orleans, LA
Environment: Urban
 
Big Idea:

Students work to solve multiple 3 part number sentences and determine if they are equal or not! Students practice using less than, equal to and greater than language!

 
Favorites (4)
 
Resources (17)
 
Reflections (1)
image
   

How Many In My Hand?

1st Grade Math » Unit: Building Numbers
1st Grade Math » Unit: Building Numbers
Thomas Young
Waitsfield, VT
Environment: Suburban
 
Big Idea:

Today everyone becomes a magician as students are able to use a known starting number and one chunk (addend) of that known number, to determine the amount that is being hidden.

 
Favorites (7)
 
Resources (20)
 
Reflections (1)
lesson image
   

Life-size Missing Parts of 9

1st Grade Math » Unit: Understanding Subtraction
1st Grade Math » Unit: Understanding Subtraction
Jennifer Moon
Oklahoma City, OK
Environment: Urban
 
Big Idea:

I want them to develop fluency in subtraction and get them ready for future standards like 1.NBT.C.6, double digit subtraction. This can be done by providing them multiple opportunities to problem solve.

 
Favorites (1)
 
Resources (15)
 
Reflections (1)
our class poster of 9 lesson
   

Unknown Addend Problems

1st Grade Math » Unit: Subtraction Strategies
1st Grade Math » Unit: Subtraction Strategies
Jennifer Moon
Oklahoma City, OK
Environment: Urban
 
Big Idea:

I CAN is a big statement. Students have been practicing subtraction and we want them to persevere and solve word problems to create their own subtraction number sentences. They will use known addition facts to solve subtraction problems.

 
Favorites (7)
 
Resources (17)
 
Reflections (1)
puzzle
   

Scoot for the Missing Parts of 8

1st Grade Math » Unit: Understanding Subtraction
1st Grade Math » Unit: Understanding Subtraction
Jennifer Moon
Oklahoma City, OK
Environment: Urban
 
Big Idea:

I want my students to develop fluency in subtraction and get them ready for future standards like 1.NBT.6, double digit subtraction. This can be done by providing them multiple opportunities to problem solve.

 
Favorites (5)
 
Resources (16)
 
Reflections (1)
domino models lesson
   

End of Unit Assessment

1st Grade Math » Unit: Complements of 10 and 20
1st Grade Math » Unit: Complements of 10 and 20
Thomas Young
Waitsfield, VT
Environment: Suburban
 
Big Idea:

Today's lesson will allow you to see how your students have developed with their understanding of groupings, complements of 10 and 20 and how fluently they can add and/or subtract within 10.

 
Resources (16)
 
Reflections (1)
lesson image
   

The Number Ten

1st Grade Math » Unit: The Number 10 and the Addition and Subtraction Concept
1st Grade Math » Unit: The Number 10 and the Addition and Subtraction Concept
Thomas Young
Waitsfield, VT
Environment: Suburban
 
Big Idea:

Students will revisit an old routine as they work with larger groups of dots and record the number of dots that were flashed before them. Students will represent a variety of ways to represent the number 10.

 
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Resources (27)
 
Reflections (1)
ways that 10 was
   

Detectives are on the HUNT for Missing parts of 6 and 7!

1st Grade Math » Unit: Understanding Subtraction
1st Grade Math » Unit: Understanding Subtraction
Jennifer Moon
Oklahoma City, OK
Environment: Urban
 
Big Idea:

Detectives it is time to search! The children will become great investigators and solve problems by finding the missing part.

 
Favorites (5)
 
Resources (23)
 
Reflections (2)
reading nate the
Common Core Math
 
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